One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,4)(13,14,17,20,18,21,26,28)(15,22,23,24,19,27,25,16)(5,6,8,9)(7,10,11,12)(13,15)(14,16)(17,25)(18,19)(20,27)(21,24)(22,28)(23,26)(2,4)(6,9)(7,11)(13,16)(14,19)(15,21)(17,22)(18,24)(20,25)(23,28)(26,27) involution — undirected(5,7)(6,10)(8,11)(9,12)(13,16)(14,15)(17,22)(18,24)(19,21)(20,23)(25,28)(26,27) involution — undirected(6,9)(7,11)(15,19)(16,24)(22,27)(23,25) involution — undirectedA Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.